-package MooseX::Meta::TypeConstraint::Structured;
+package ## Hide from PAUSE
+ MooseX::Meta::TypeConstraint::Structured;
use Moose;
+use Devel::PartialDump;
use Moose::Util::TypeConstraints ();
+use MooseX::Meta::TypeCoercion::Structured;
extends 'Moose::Meta::TypeConstraint';
=head1 NAME
=cut
-has 'constraint_generator' => (is=>'ro', isa=>'CodeRef');
+has 'constraint_generator' => (
+ is=>'ro',
+ isa=>'CodeRef',
+ predicate=>'has_constraint_generator',
+);
=head1 METHODS
This class defines the following methods.
+=head2 new
+
+Initialization stuff.
+
+=cut
+
+around 'new' => sub {
+ my ($new, $class, @args) = @_;
+ my $self = $class->$new(@args);
+ $self->coercion(MooseX::Meta::TypeCoercion::Structured->new(
+ type_constraint => $self,
+ ));
+ return $self;
+};
+
+=head2 validate
+
+Messing with validate so that we can support niced error messages.
+=cut
+
+override 'validate' => sub {
+ my ($self, @args) = @_;
+ my $message = bless {message=>undef}, 'MooseX::Types::Structured::Message';
+
+ if ($self->_compiled_type_constraint->(@args, $message)) {
+ ## Everything is good, no error message to return
+ return undef;
+ } else {
+ ## Whoops, need to figure out the right error message
+ my $args = Devel::PartialDump::dump(@args);
+ if(my $message = $message->{message}) {
+ return $self->get_message("$args, Internal Validation Error is: $message");
+ } else {
+ return $self->get_message($args);
+ }
+ }
+};
+
=head2 generate_constraint_for ($type_constraints)
Given some type constraints, use them to generate validation rules for an ref
sub generate_constraint_for {
my ($self, $type_constraints) = @_;
return sub {
+ my $arg = shift @_;
my $constraint_generator = $self->constraint_generator;
- return $constraint_generator->($type_constraints, @_);
+ my $result = $constraint_generator->($type_constraints, $arg, $_[0]);
+ return $result;
};
}
=cut
sub parameterize {
+
my ($self, @type_constraints) = @_;
+ my $class = ref $self;
my $name = $self->name .'['. join(',', map {"$_"} @type_constraints) .']';
- return __PACKAGE__->new(
+ my $constraint_generator = $self->__infer_constraint_generator;
+
+ return $class->new(
name => $name,
parent => $self,
type_constraints => \@type_constraints,
- constraint_generator => $self->constraint_generator,
+ constraint_generator => $constraint_generator,
);
}
+=head2 __infer_constraint_generator
+
+This returns a CODEREF which generates a suitable constraint generator. Not
+user servicable, you'll never call this directly.
+
+=cut
+
+sub __infer_constraint_generator {
+ my ($self) = @_;
+ if($self->has_constraint_generator) {
+ return $self->constraint_generator;
+ } else {
+ return sub {
+ ## I'm not sure about this stuff but everything seems to work
+ my $tc = shift @_;
+ my $merged_tc = [@$tc, @{$self->parent->type_constraints}];
+ $self->constraint->($merged_tc, @_);
+ };
+ }
+}
+
=head2 compile_type_constraint
hook into compile_type_constraint so we can set the correct validation rules.
return $self->$compile_type_constraint(@args);
};
+=head2 create_child_type
+
+modifier to make sure we get the constraint_generator
+
+=cut
+
+around 'create_child_type' => sub {
+ my ($create_child_type, $self, %opts) = @_;
+ return $self->$create_child_type(
+ %opts,
+ constraint_generator => $self->__infer_constraint_generator,
+ );
+};
+
+=head2 is_a_type_of
+
+=head2 is_subtype_of
+
+=head2 equals
+
+Override the base class behavior.
+
+=cut
+
+sub equals {
+ my ( $self, $type_or_name ) = @_;
+ my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+
+ return unless $other->isa(__PACKAGE__);
+
+ return (
+ $self->type_constraints_equals($other)
+ and
+ $self->parent->equals( $other->parent )
+ );
+}
+
+=head2 type_constraints_equals
+
+Checks to see if the internal type contraints are equal.
+
+=cut
+
+sub type_constraints_equals {
+ my ($self, $other) = @_;
+ my @self_type_constraints = @{$self->type_constraints||[]};
+ my @other_type_constraints = @{$other->type_constraints||[]};
+
+ ## Incoming ay be either arrayref or hashref, need top compare both
+ while(@self_type_constraints) {
+ my $self_type_constraint = shift @self_type_constraints;
+ my $other_type_constraint = shift @other_type_constraints
+ || return; ## $other needs the same number of children.
+
+ if( ref $self_type_constraint) {
+ $self_type_constraint->equals($other_type_constraint)
+ || return; ## type constraints obviously need top be equal
+ } else {
+ $self_type_constraint eq $other_type_constraint
+ || return; ## strings should be equal
+ }
+
+ }
+
+ return 1; ##If we get this far, everything is good.
+}
+
+=head2 get_message
+
+Give you a better peek into what's causing the error. For now we stringify the
+incoming deep value with L<Devel::PartialDump> and pass that on to either your
+custom error message or the default one. In the future we'll try to provide a
+more complete stack trace of the actual offending elements
+
+=cut
+
+around 'get_message' => sub {
+ my ($get_message, $self, $value) = @_;
+ $value = Devel::PartialDump::dump($value)
+ if ref $value;
+ return $self->$get_message($value);
+};
+
=head1 SEE ALSO
The following modules or resources may be of interest.
=cut
-1;
\ No newline at end of file
+__PACKAGE__->meta->make_immutable;
\ No newline at end of file
projects / gitmo/MooseX-Types-Structured.git / blobdiff